class Employee():
    """描述一位雇员的信息"""
    def __init__(self, first_name, last_name, salary):
        """初始化雇员的姓名和年薪"""

        self.first_name = first_name
        self.last_name = last_name
        self.salary = salary

    def give_raise(self, increment=5000):
        """为雇员加薪，默认为五千美元"""

        self.salary += increment

    def get_info(self):
        """获取雇员信息"""
        info = self.first_name.title() + ' ' + self.last_name.title() \
               + ' -- ' + str(self.salary) + ' $'

        return info